Connected: An Internet Encyclopedia
RFC 1035 - 6.4. Inverse queries (Optional)

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### 6.4. Inverse queries (Optional)

Inverse queries are an optional part of the DNS. Name servers are not required to support any form of inverse queries. If a name server receives an inverse query that it does not support, it returns an error response with the "Not Implemented" error set in the header. While inverse query support is optional, all name servers must be at least able to return the error response.

6.4.1. The contents of inverse queries and responses
6.4.2. Inverse query and response example
6.4.3. Inverse query processing

Next: 6.4.1. The contents of inverse queries and responses

Connected: An Internet Encyclopedia
RFC 1035 - 6.4. Inverse queries (Optional)